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Additive for photoconductor end seal wear mitigation

a photoconductor and additive technology, applied in the field of photoconductor, can solve the problem of unfulfilled need to eliminate end-seal wear, and achieve the effect of easy preparation and coating, and easy dispersion into polycarbonate-based charge transport formulations

Active Publication Date: 2007-06-21
LEXMARK INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes an organic photoconductor that doesn't wear down easily. The invention uses a specific charge transport additive, called poly(methyl methacrylate-co-ethylene glycol dimethacrylate) as small particles. These particles are easily dispersed into the charge transport formulation and resistant to settling, resulting in a more uniform distribution without the need for agitation. The technical effect of this invention is improved performance and durability of organic photoconductors.

Problems solved by technology

However, when printing in hot or wet environments, the exposed aluminum accepts current from the charge roller.
There remains an unfulfilled need to eliminate end-seal wear on the photoconductor that is (1) easily manufactured, (2) low cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1 (

Charge Generation Layer)

[0016] Preparation of the titanylphthalocyanine dispersion for the charge generation layer is described in U.S. Pat. No. 5,994,014 to Hinch et al. The dispersion is coated over cylindrical anodized substrates to about 0.5μ via dip coating. The thickness of the layer is conveniently tracked by recording the optical density using a Macbeth TR524 densitometer.

example 2 (

Electrostatics)

[0017] Table 1 summarizes the charge transport formulation and material weights (in grams) for Example 2.

TABLE 1MaterialControl1% Additive2% Additive3% AdditiveTHF2862862862861,4-dioxane82828282TPD40404040PCA60595857DC-566 drops6 drops6 drops6 dropsAdditive0123

[0018] Materials in Table 1 and other Tables are: [0019] TPD: N,N′-diphenyl-N,N′-di(m-tolyl)-p-benzidene-N,N′-diphenyl-N,N′-bis(3-methylphenyl)-(1,1′-biphenyl)-4,4′-diamine, commercially from Sentient Imaging Technologies GmbH.

[0020] PCA: Polycarbonate A, commercially available Bayer Chemical Co. as Makrolon 5208.

[0021] DC-56: (ethylmethyl, methyl(2-phenylpropyl) siloxane, commercially available from Dow Corning Corp.

[0022] Additive: poly(methyl methacrylate-co-ethylene glycol dimethacrylate), commercially available from Aldrich Chemical Co.

[0023] Poly(methyl methacrylate-co-ethylene glycol dimethacrylate), commercially available from Aldrich Chemical Co., is added to a vigorously stirring solution of THF / ...

example 3 (

End-Seal Wear)

[0026] Organic photoconductors containing 3% poly(methyl methacrylate-co-ethylene glycol dimethacrylate) were prepared as described in Examples 1 and 2. Photoconductors were also prepared without additive for use as controls. Two drums of each set were run to 40 k prints in Lexmark OPTRA T 620 printers. A summary of the end-seal wear performance is shown in the following table. End seal wear is that experience by a photoconductor roller having an end seals on opposite sides.

TABLE 4End-Seal Wear ComparisonEnd-Seal WearWidth of End-SealWidth of End-SealOPC# of Drums(Onset)Wear (mm), TopWear (mm), BottomControl2ca. 15k4 mm5 mm3% Additive2NA00

[0027] The table above shows the absence of end-seal wear, even after 40 k prints, for OPC drums containing 3% poly(methyl methacrylate-co-ethylene glycol dimethacrylate).

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Abstract

This invention provides an organic photoconductor which does not experience end-seal wear in normal use. This invention provides charge transport formulation that is easily prepared and coated by standard, dip-coating methods. This is realized by addition of a small amount of poly(methyl methacrylate-co-ethylene glycol dimethacrylate). Commercially available, 8μ spherical particles are used. These microspheres are insoluble in common organic solvents, but are readily dispersed into polycarbonate-based charge transport formulations. A photoconductor roller is mounted in pressure engagement with two end seals, each on opposite side of the roller.

Description

TECHNICAL FIELD [0001] This invention relates to the use of a laminate-type organic photoconductor in electrophotographic printing. More particularly, the invention describes a photoconductor with greatly improved end-seal wear. BACKGROUND OF THE INVENTION [0002] Personal and network laser printers have become ubiquitous in both home and office environments. An important driver for these placements is the lower cost of the printers. Replaceable cartridges supply laser-printer toner, as well as other components of the electrophotographic process. More robust cartridge components are desired to meet requirements for print speed and cartridge life. A critical component to the electrophotographic process, and thus of the typical printer cartridge, is the organic photoconductor (OPC). [0003] An electrophotographic photoreceptor of the dual-layer, laminate-type is composed of a conductive substrate, a thin charge generation layer (CGL) coated over the substrate, and a much thicker charge ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03G5/147
CPCG03G5/0546G03G5/0567G03G5/14734G03G5/1476
Inventor BLACK, DAVID GLENN
Owner LEXMARK INT INC
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